1. a deep valley with steep rocky sides, typically formed by water erosion

Examples

• The Grand Canyon is one of the most famous natural landmarks in the United States.
• We hiked down into the canyon to reach the river below.
• The narrow canyon walls towered hundreds of feet above us.
• Flash floods can be extremely dangerous in desert canyons.
• The Colorado River carved this magnificent canyon over millions of years.
• From the rim, we could see the layered rock formations in the canyon walls.